Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-05-28
2001-03-06
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C239S124000
Reexamination Certificate
active
06196193
ABSTRACT:
PRIOR ART
The invention is based on a fuel injection device for a vehicle. In a fuel injection device of this kind, which has been disclosed by DE 44 06 901, a 3-way valve is used, which allows the control chamber to communicate either exclusively with the high-pressure fuel source or exclusively with a fuel return container. The actuation of the valve member of this 3-way valve is executed with the aid of an electromagnet. With this known embodiment, the injection valve member is brought either into a completely open position or into a completely closed position, depending on the triggering of the 3-way valve.
ADVANTAGES OF THE INVENTION
The fuel injection device according to the invention has an advantage over the prior art that the valve body of the valve member can be brought into an intermediary position so that through the corresponding control of the simultaneously existing connection to the high-pressure fuel source on the one hand and to the relief chamber on the other, the control chamber has a lower or higher pressure than if the control chamber were to be connected exclusively to one or the other of the pressure levels. Consequently, the injection valve member can also assume an intermediary position corresponding to a partial opening, which permits the valve member to produce a reduced injection rate of fuel into the combustion chamber in this position. A 3-way valve of the type defined can thus be used to advantageously produce a pre-injection that typically requires only a very small injection quantity. Through the partial excitation of the piezoelectric element or of the magnetostrictive element, the valve member executes a partial path and stays in a position between the two valve seats. Then, the valve member can be brought back into a position pushing against the control chamber in order to interrupt the fuel injection between a pre-injection and a main injection in order to be finally brought into a position that completely shuts off the inflow conduit, which leads to the discharge of the control chamber and produces the main injection that follows the pre-injection.
Accordingly, the tappet that actuates the valve body of the valve member is advantageously connected to this valve body. In order to adjust the relief dynamics, a throttle is advantageously disposed in the outflow conduit.
REFERENCES:
patent: 4465231 (1984-08-01), Sharp
patent: 5255845 (1993-10-01), Brunel
patent: 5282574 (1994-02-01), Koch
patent: 5779149 (1998-07-01), Hayes, Jr.
patent: 44 06 901 (1995-09-01), None
patent: 44 34 892 (1996-04-01), None
patent: 29708 369 (1997-07-01), None
patent: 0615 064 (1994-09-01), None
Boecking Friedrich
Heinz Rudolf
Potschin Roger
Schmoll Klaus-Peter
Gimie Mahmoud M.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Yuen Henry C.
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